Advances in Artificial Life: 9th European Conference, ECAL by Pietro Speroni di Fenizio, Peter Dittrich (auth.), Fernando

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By Pietro Speroni di Fenizio, Peter Dittrich (auth.), Fernando Almeida e Costa, Luis Mateus Rocha, Ernesto Costa, Inman Harvey, António Coutinho (eds.)

This booklet constitutes the refereed complaints of the ninth ecu convention on man made lifestyles, ECAL 2007, held in Lisbon, Portugal, September 2007.

The one hundred twenty five revised complete papers provided have been rigorously reviewed and chosen. The papers are equipped in topical sections on conceptual articles, morphogenesis and improvement, robotics and self sustaining brokers, evolutionary computation and idea, mobile automata, versions of organic structures and their purposes, ant colony and swarm platforms, evolution of communique, simulation of social interactions, self-replication, synthetic chemistry, and posters.

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Additional info for Advances in Artificial Life: 9th European Conference, ECAL 2007, Lisbon, Portugal, September 10-14, 2007. Proceedings

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2(a)). Cubicle v-molecules do not have this attribute. 2 Extending Patterns Each reaction pool has a set of recombination rules. A recombination rule is described in terms of patterns in a similar way as in the basic artificial chemistry. There are two main differences. First, patterns are extended so as to deal with the directions of v-molecules on membranes. Second, a pattern that matches an arbitrary membrane — the membrane pattern, denoted by “@” — is introduced. Cubicle pools and membrane pools use patterns extended in different ways.

When a replication event occurs, a molecule is no longer removed. Instead, the absolute number of molecules in the protocell is allowed to increase. However, at a specified maximum size, the protocell spontaneously undergoes binary fission to give two offspring protocells, each containing a random selection of half of the molecules from the parent. There is now a finite limit on the number of protocells. Thus, when a protocell reproduces, another protocell is chosen at random and discarded (along with its entire molecular contents).

Diffusion/transport across the cell membrane is also allowed, although we work under the assumption that a pure lipid bilayer is only permeable to a few species (in the following simulations: to the nutrient X and waste W molecules). Spontaneous diffusion processes (for a generic membrane penetrating substance Z) are driven by the concentration gradient: g Z = ([ Z ] − [ Z ] ) l µ (where l µ : bilayer thickness). Env Core The resulting molecular flux will be inwards or outwards depending on whether g Z is greater or smaller than zero.

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